In this study we investigate anisotropic transmission properties of the membrane films impregnated with nematic LC materials in the THz frequency region. Typical experimental result shows that transmittance of membrane film without LC material is almost 100% in THz region. Phase change of the THz wave is observed but the transmittance does not decrease so much after impregnating LC material. Refractive index anisotropy increases after impregnating LC material which is related to the molecular orientation in the membrane film. These results show that the membrane film has a potential application to the LC device components in the THz region.